Remove support for sx from ActionList component and sub-components

[llastflowers]

Closes #6757

Current sx usage: 7

✅ sx usages are only in repos other than github-ui; those usages have been added to the tracking issue

Changelog

Removed

Remove support for sx from the ActionList component, and any sub-components, associated stories, docs, and tests

Rollout strategy

• Major release; if selected, include a written rollout or migration plan

This component currently has 0 sx usage in dotcom, and therefore does not need the @primer/styled-react wrapper. this will be confirmed again before merging.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: 8e30feb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@primer/react	Major
@primer/styled-react	Major

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Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[primer-integration]

🟢 ci completed with status success.

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[francinelucca]

Needs https://github.com/github/github-ui/pull/3730/commits/bcf12f71cd670e35ae6b424b8f870e7c699a5895, https://github.com/github/github-ui/pull/3730/commits/bf13cf1eb00e6c721325795a1d2268768a77d2f4, https://github.com/github/github-ui/pull/3730/commits/3cceae48570a9ff3b8f0812d99fe98c388b9e12c, https://github.com/github/github-ui/pull/3730/commits/ab909792d39a58421e8797b12f6a8ad1a0639a5d, https://github.com/github/github-ui/pull/3730/commits/f45399633ed48330ab3b07ce5a26828827a8767b